Daml Fundamentals Certificate Sample App

Guess the number

This collection of contracts implements a "Guess the Number" game in DAML

There are three types of parties:

• Game Master: This party records their secret number on the ledger and invites players to participate.
• Public observer: The public observer can see all games that are currently going on, but not the secret numbers
• Players: Players are invited parties who can submit a single guess which the game master can compare against the secret.

Starting the game

The game master creates a Secret contract and a GuessingGame contract which refers to it.

Inviting players

The game master produces GameInvitation contracts for all the parties it wishes to invite to play the game.

Players can decline the invitation or make a guess by exercising RejectInvitation or MakeGuess, respectively.

Determining a winner

The game master processes GamePlayerGuess contracts by submitting them for comparison against the secret. If a guess is correct, the game automatically ends and a GuessingGameResult contract records the winner and the secret number. The result contract is signed by both the winner and the game master.

Building

To compile the project

$ daml build

Testing

To test all scripts: Either run the pre-written script in the Test.daml under /daml OR run:

$ daml start

Running

To load the project into the sandbox and start navigator:

$ daml start